No need to make any payments, when either AVG, Avast or Comodo will do the job superbly. Use only one of the products, using two or more will cause conflicting problems.
I use AVG on one computer, Avast on another, but Comodo as some very good review results of late. I am due to get another computer soon, so perhaps Comodo might end up on that. I just love experimenting with software products ;o)